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  1. #14
    Join Date
    Jun 2003
    Location
    Texas
    Posts
    1,159

    I calibrate

    mine against the gas they are hooked up to.

  2. #15
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,264
    I have two manifold sets of the Ritchie Yellow Jacket gauges with 72" hoses and one set of direct couplers w/o hoses for ice machine work.

    I've never had any gauges accurately calibrated like with a laboratory standard gauge. I often just check my suction gauge on the fly, like when a R22 compressor on a walk-in cycles off you watch where the gauge stops briefly at 58# (32 Deg) while any accumulated frost melts off the coil. That's accurate enough for me.

    The high pressure gauge isn't as critical generally, but you can always check it by getting a pressure and temperature reading from a refrigerant tank that's been sitting in a stable temperature overnight, like at the shop.

  3. #16

    Talking

    If they are off a few psi who gives a crap anyway?
    Hey cockroach, don't bug me!

    www.AskTheDiceman.com

    www.TheColdConspiracy.com

    www.Pennwood-HVAC.Com

    Bring Em Home....

  4. #17
    Join Date
    Jul 2000
    Location
    Guayaquil EC
    Posts
    10,264

    Dice.........

    If your suction gauge is off by a couple of pounds you won't get an accurate superheat rea.......oh, never mind.

  5. #18

    Talking

    Yeah Ice, like I said, who gives a crap.
    Hey cockroach, don't bug me!

    www.AskTheDiceman.com

    www.TheColdConspiracy.com

    www.Pennwood-HVAC.Com

    Bring Em Home....

  6. #19
    bryan l Guest
    Originally posted by frozensolid
    Transducers lie Thats why they have offsets.
    gauges lie also, thats why they have adjustment screws.

    Transducers are right more often than you think. I dont believe there always accurate, but they often are. lets face it, they take less abuse than most mechanics gauges. In the 8 years I have been doing supermarket work I have only found 2 faulty transducers and one that I had to put an offset into. Most of the transducers out there that fail or read wonky pressures are the ones that have been pulled into a vac, unless there designed for it never pull them into one.

  7. #20
    Join Date
    Oct 2001
    Location
    Key largo
    Posts
    4

    want to know a secret?

    My gauges have been knocked around and abused like most of us. The gauges have not have to be recalibrated once in 7 years! I use a richie manifold with a set of Marsh Gauges, I bought when Unitied use to sell them, they no longer handle them
    I found a replacement set in a farmers supply house 20 miles north of me. I now have a set waiting for the original set to crap out
    I swear by these suckers
    Bob Key Largo

  8. #21
    Join Date
    Apr 2001
    Location
    Camel City, NC
    Posts
    6,232

    Guages

    Replace mine twice a year. Used set for spare. Check valves one on set and not on others. 5' yellow jacket hoses and guages. They need to be on 0 when you start or add or subtract. Nice to have flutterless guages now so you don't have to kink the hose.
    Be safe not fast. body parts don't grow back

  9. #22
    Join Date
    Jul 2001
    Location
    Gold Coast of Connecticut
    Posts
    4,570
    Wow Dice you mad?

  10. #23
    No, not mad, possibly insane though.
    Hey cockroach, don't bug me!

    www.AskTheDiceman.com

    www.TheColdConspiracy.com

    www.Pennwood-HVAC.Com

    Bring Em Home....

  11. #24
    Join Date
    Dec 2002
    Posts
    174

    I occasionally...

    ...put my fluke heat clamp on a line next to a schrader fitting where may gage is attached and look at a P/T chart and check that against what my gage reads...my Fluke is pretty trustworthy

  12. #25
    Originally posted by condenseddave
    I beat the living hell out of essentially all of my tools. If they can't take it, they weren't worth having.

    The Yellow Jacket gauges with the brass cases are rated for 1% accuracy, and I have a half-dozen sets of them.

    I only use JB gauges and manifolds for two purposes:
    • Double Low pressure
      • Net oil pressure. (Double low sides on one manifold.) I carry 4 sets of these at all times.
      • Suction core pressure drop.
    • Double high pressure.
      • Liquid line filter pressure drop.
      • Holdback valve differential.
      • Defrost differential valves.
      • Any other high side app where I need to measure differential.



    I carry around 2 dozen sets all the time.

    STOP Dave .... your breaking my heart!!! You mean to tell me I need to buy a couple of DOZEN sets of gages???

    IYEEEEEEEE!!!


    I thought I was rich with having three sets around!
    Now it appears in market circles .. I am but a pauper!


  13. #26
    Originally posted by Diceman
    I'm not allowed to say anything.
    Go ahead DIce, take a deep breth .... say "anything" .....



    There .... now wasnt that better?








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